JP2024102365A - Coriolis flow meter with flow tube including inserts - Google Patents

Abstract

To provide a Coriolis flow meter with improved measurement accuracy under laminar flow conditions.SOLUTION: A Coriolis flow meter comprises: a driver coupled to a flow tube 800 and configured to oscillate the flow tube in a drive direction; a pick-off sensor coupled to the flow tube and configured to measure a movement of the flow tube 800; and the flow tube. The flow tube comprises: a conduit 852 having an interior surface 854; and a plurality of inserts 856a, 856b, 856c, 856d, where each of the inserts 856a, 856b, 856c, 856d is coupled to at least a first position on the interior surface of the conduit 852.SELECTED DRAWING: Figure 8

Description

The embodiments described below relate to a Coriolis flowmeter, and more particularly, to a Coriolis flowmeter having a flow tube with an insert.

A Coriolis flow meter is a type of flow meter that can be used to measure mass flow, density, volumetric flow, and provide other information about flowing materials. Flowing materials can include liquids, gases, mixtures of liquids and gases, solids suspended in liquids, and liquids containing gases and suspended solids.

FIG. 1 illustrates an example Coriolis flowmeter 100 that includes a meter assembly 10 and meter electronics 20. The meter assembly 10 responds to changes in the flow of a process material. The meter electronics 20 connects to the meter assembly 10 via leads 102 or wirelessly and can provide density, volumetric flow rate, and mass flow rate information, among other information, via a meter electronics interface 26.

In this example, Coriolis flowmeter 100 includes two curved flow tubes 130 and 130'. However, in further embodiments, Coriolis flowmeter 100 may include a single flow tube, or three or more flow tubes. Alternatively, Coriolis flowmeter 100 may include one or more curved or straight flow tubes, as would be understood by one of ordinary skill in the art.

The exemplary meter assembly 10 includes a pair of manifolds 150 and 150', flanges 103 and 103', a pair of parallel flow tubes 130 and 130', a driver 180, and a pair of pickoff sensors 170L and 170R. The flow tubes 130 and 130' are bent at two symmetrical locations along their lengths and are essentially parallel throughout their lengths. Reinforcement bars 140 and 140' function to define a central axis of vibration for each flow tube.

When flanges 103 and 103' are connected via inlet end 104 and outlet end 104' to a process line (not shown) carrying the process material being measured, the material enters the meter's inlet end 104 through flange 103 and is directed through manifold 150 to flow tube mounting block 120. The material is split in manifold 150 and sent through flow tubes 130 and 130'. Upon exiting flow tubes 130 and 130', the process material recombines in manifold 150' through flow tube mounting block 120' into a single stream before being sent to outlet end 104', which is connected by flange 103' to the process line (not shown).

Both flow tubes 130 and 130' are driven in opposite directions by a driver 180, in what is called the first anti-phase bending mode of the Coriolis flowmeter 100. Both flow tubes 130 and 130' are driven in opposite directions by a driver 180, in what is called the first anti-phase bending mode of the Coriolis flowmeter 100. This driver 180 can comprise any one of a number of well-known configurations, such as a magnet attached to flow tube 130' and an opposing coil attached to flow tube 130 through which an alternating current is passed to vibrate both flow tubes. An appropriate driver voltage is applied to the driver 180 by the meter electronics 20.

Meter electronics 20 provides drive signals to driver 180 to vibrate flow tubes 130 and 130'. Meter electronics 20 receives left and right velocity signals from pickoff sensors 170L and 170R to calculate mass flow rate, volume flow rate, and/or density information for the flow passing through meter assembly 10.

Pickoff sensors 170L and 170R measure the displacement of flow tubes 130 and 130' as they vibrate. With no flow through flow tubes 130 and 130', the signals of pickoff sensors 170L and 170R are in phase. However, when flow begins through the vibrating tubes, a Coriolis force is induced in the tubes.

Fluids flowing through a Coriolis flow meter may exhibit laminar flow. Fluids under laminar flow in a conduit have a slower velocity adjacent to the conduit boundary and a faster velocity away from the boundary. Because of this, a conventional Coriolis flow meter may produce a smaller mass Coriolis force and a correspondingly smaller mass flow measurement. Due to laminar flow, a conventional Coriolis flow meter may thereby undermeasure the fluid flow.

What is needed is a Coriolis flowmeter that provides improved measurement accuracy under laminar flow conditions.

According to one embodiment, a Coriolis flowmeter is provided. The Coriolis flowmeter includes a driver coupled to a flow tube and configured to vibrate the flow tube in a drive direction, a pickoff sensor coupled to the flow tube and configured to measure movement of the flow tube, and the flow tube includes a conduit having an inner surface and a plurality of inserts, each of the plurality of inserts being coupled to at least a first location on the inner surface of the conduit.

According to one embodiment, a method of assembling a Coriolis flowmeter is provided. The method includes providing a flow tube, coupling a driver to the flow tube, the driver configured to vibrate the flow tube in a drive direction, and coupling a pick-off sensor to the flow tube, the pick-off sensor configured to measure movement of the flow tube, the flow tube including a conduit having an inner surface and a plurality of inserts, each of the plurality of inserts coupled to at least a first location on the inner surface of the conduit.

[Aspects]
According to one aspect, the plurality of inserts may be molded as rods.

According to one embodiment, the inserts may be molded as fins.

According to one aspect, the first position of at least one of the plurality of inserts may be within the active portion of the conduit.

According to one aspect, the first location on the inner surface of the conduit may be within a bend in the conduit.

According to one embodiment, each of the plurality of inserts may extend across at least 25% of the diameter of the conduit.

According to one aspect, each of the plurality of inserts may include a first end coupled to a first location and a second end coupled to at least a second location on the inner surface of the conduit.

According to one embodiment, the diameter of the conduit can be at least 2 inches.

According to one aspect, the plurality of inserts can include a first insert having a first longitudinal direction and a second insert having a second longitudinal direction, the first longitudinal direction being offset from the second longitudinal direction by 45 degrees or more.

According to one embodiment, the inserts may be molded as rods.

According to one embodiment, the inserts may be molded as fins.

According to one aspect, the first position of at least one of the plurality of inserts may be within the active portion of the conduit.

According to one aspect, the first location on the inner surface of the conduit may be within a bend in the conduit.

According to one embodiment, each of the plurality of inserts may extend across at least 25% of the diameter of the conduit.

According to one aspect, each of the plurality of inserts may include a first end coupled to a first location and a second end coupled to at least a second location on the inner surface of the conduit.

According to one embodiment, the diameter of the conduit can be at least 2 inches.

According to one aspect, the plurality of inserts can include a first insert having a first longitudinal direction and a second insert having a second longitudinal direction, the first longitudinal direction being offset from the second longitudinal direction by 45 degrees or more.

Like reference numbers represent like elements in all drawings. It should be understood that the drawings are not necessarily to scale.
FIG. 1 illustrates a flow meter 100 according to one embodiment. FIG. 2 illustrates a movable flow tube 200 according to one embodiment. FIG. 3A illustrates a movable flow tube 300 according to one embodiment, and FIG. 3B illustrates a plot 350 according to one embodiment. FIG. 4A illustrates a movable flow tube 400 according to one embodiment, and FIG. 4B illustrates a plot 450 according to one embodiment. FIG. 5A illustrates a fluid flow 500 according to one embodiment, and FIG. 5B illustrates a fluid flow 550 according to one embodiment. FIG. 6 illustrates a plot 600 according to one embodiment. FIG. 7A illustrates a fluid flow 700 according to one embodiment, FIG. 7B illustrates a fluid flow 720 according to one embodiment, FIG. 7C illustrates a fluid flow 740 according to one embodiment, and FIG. 7D illustrates a fluid flow 760 according to one embodiment. FIG. 8A illustrates a flow tube 800 according to one embodiment, and FIG. 8B illustrates a detail 850 of the flow tube 800 according to one embodiment. FIG. 9 illustrates a flow tube 900 according to one embodiment. FIG. 10 illustrates a method 1000 according to one embodiment.

2-10 and the following description provide specific examples to teach those skilled in the art how to make and use the best mode of the present application. For the purpose of teaching the principles of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will recognize variations from these examples that fall within the scope of the present application. Those skilled in the art will recognize that the features described below can be combined in various ways to form multiple variations of the present application. As a result, the present application is not limited to the specific examples described below, but only by the claims and their equivalents.

Figure 2 shows a movable flow tube 200. The movable flow tube 200, including the flow tubes 130, 130' of the flow meter 100, vibrates in a first anti-phase bending mode (drive mode) in the no fluid flow condition shown. As seen in Figure 1, pick-off sensors 170R, 170L are coupled to the flow tubes 130, 130' on either side of the driver 180 and measure the displacement of the flow tubes 130, 130' as they vibrate. Under no flow conditions as shown in Figure 2, the pick-off sensors 170R, 170L provide symmetric phase signals. However, when fluid flow begins through the vibrating tubes, Coriolis forces are induced in the tubes.

ここで、

はコリオリ力、ｍは質量、

は角回転、

は流体の速度である。逆位相曲げモードにおける流体流を伴うコリオリ力は、図３Ａの可動流管３００に見ることができる。角運動量

速度、

およびコリオリ力

を含む力ベクトルの２つの例が、ドライバ１８０の両側において、図３Ａの可動流管３００の上に重ねられている。 The equation for the Coriolis force is:

here,

is the Coriolis force, m is the mass,

is the angular rotation,

is the velocity of the fluid. The Coriolis force accompanying the fluid flow in the anti-phase bending mode can be seen in the movable flow tube 300 of FIG. 3A. Angular momentum

speed,

and the Coriolis force

Two example force vectors including:

は、ドライバの両側で反対方向を指していることが分かる。 The Coriolis force distribution along the movable flow tube 300 in the anti-phase bending mode is depicted in plot 350 of FIG. 3B. In plot 350, the X-axis is distance along the axis of the flow tube 130 and the Y-axis is Coriolis force. Superimposed on the plot 350 are example positions of the pickoff sensors 170L, 170R and the driver 180. The Coriolis force vector

can be seen pointing in opposite directions on either side of the driver.

に正比例する。

ここで、ＦＣＦ（グラム／（秒又はマイクロ秒））はメータの流量校正係数である。流量較正係数ＦＣＦは、多くの場合、試験条件下で製造業者によって決定される。 FIG 4A shows a movable flow tube 400. The movable flow tube 400 includes two flow tubes 130, 130' in an anti-phase bending mode with fluid flow. FIG 4B shows a plot 450 of the phase detected by pickoff sensors 170L and 170R while fluid is flowing. As can be seen from plot 450, the phase difference between the motion detected by pickoff sensors 170L and 170R is the phase offset Δφ. The phase offset Δφ is a function of the mass flow rate of the fluid under test.

is directly proportional to

where FCF (grams/(second or microsecond)) is the flow calibration factor of the meter. The flow calibration factor FCF is often determined by the manufacturer under test conditions.

ここで、ρは密度、Ｖは速度、Ｄは直径、μは粘度である。レイノルズ数Ｒｅが２０００以下では流体はほぼ層流であり、４０００以上では乱流である。レイノルズ数Ｒｅが２０００と４０００との間の場合、流体は乱流と層流との遷移ゾーンにある。 Turbulent and laminar flow are determined by the Reynolds number.

where ρ is density, V is velocity, D is diameter, and μ is viscosity. Below the Reynolds number Re of 2000, the fluid is nearly laminar, and above 4000, the fluid is turbulent. For Reynolds numbers between 2000 and 4000, the fluid is in the transition zone between turbulent and laminar flow.

項が管全体にわたって一様であると仮定している。しかし、この一様流速

の仮定は乱流領域の流体にのみ適用される。層流領域の流体の速度は、流管直径に沿って変化する。 Equation 1 is the fluid velocity

It is assumed that the flow rate is uniform throughout the pipe.

This assumption applies only to fluids in the turbulent flow regime. The velocity of a fluid in the laminar flow regime varies along the diameter of the flow tube.

プロファイル（水平矢印の長さ）を描いている。図５Ａおよび５Ｂの流れは、同じ質量ｍおよび角回転

を有する流体を表す。図５Ａおよび図５Ｂに示されるように、流管の中心軸に沿って配置された速度ベクトルα１およびα２は、層流および乱流下では同じ大きさを有する。したがって、流管の中心軸に沿った、層流および乱流下の流体は、ほぼ同じ実効コリオリ力

を生成する。 5A and 5B show fluid flows 500 and 550, respectively. Fluid flows 500 and 550 are velocity profiles across the diameter of flow tube 130 (longitudinal direction) for turbulent and laminar fluid flow, respectively.

The flow profiles (length of the horizontal arrows) in Figures 5A and 5B are for the same mass m and angular rotation.

As shown in Figures 5A and 5B, the velocity vectors α1 and α2 located along the central axis of the flow tube have the same magnitude under laminar and turbulent flow. Thus, the fluid along the central axis of the flow tube under laminar and turbulent flow experiences approximately the same effective Coriolis force

Generate.

を生成しうる。したがって、層流条件下の流体の流体流５５０について求めた質量流量

は、乱流条件下の流体の流体流５００について求めた質量流量

より小さくなる可能性がある。 However, along the boundary of fluid flows 500 and 550, velocity vector β1 is shown for laminar flow and velocity vector β2 is shown for turbulent flow. For turbulent flow, velocity vectors β2 and α2 are approximately the same. However, for laminar flow, the central velocity vector α1 is greater than the outer velocity vector β1. Since the turbulent velocity vector β2 is greater than the laminar vector β1, the fluid under laminar flow experiences a Coriolis force which is less effective on the fluid under turbulent flow.

Therefore, the mass flow rate determined for the fluid flow 550 of the fluid under laminar flow conditions is

is the mass flow rate determined for the fluid flow 500 of the fluid under turbulent conditions

It may be smaller.

6 is a plot 600 illustrating the effect of low flow rate errors. Plot 600 includes a Y-axis that indicates percent volumetric error and an X-axis that indicates Reynolds number. In plot 600, fluids with Reynolds numbers below 100,000 are believed to be due to undermeasurement due to laminar flow.
An increase in the amount of negative volume error will be observed.

7A, 7B, 7C, and 7D show fluid flow 720, 740, 760, and 780 around an obstacle 702, respectively. As can be seen, the fluid enters from the left of FIGS. 7A-7D in a laminar flow and exits from the right of the figure after detouring around the obstacle 702. In FIG. 7A, the fluid has a Reynolds number Re less than 1, and the fluid becomes laminar again after passing the obstacle 702. In FIG. 7B, the fluid has a Reynolds number Re between 1 and 30, and the fluid creates a few vortices before becoming laminar again after passing the obstacle 702. In FIG. 7C, the fluid has a Reynolds number Re between 30 and 1000, and the fluid creates more vortices after passing the obstacle 702, forming a von Karman vortex street. In FIG. 7D, the fluid has a Reynolds number Re greater than 1000, and the fluid becomes turbulent for some distance along the flow tube after passing through the obstacle 702.

In one embodiment of the present application, the Reynolds number is 100.0, similar to the obstacle 702 in FIG. 7D.
To reduce the volumetric error of the fluid below 00, a fluid tube with an insert is used to generate turbulence in the fluid. For example, FIG. 8A illustrates a cross section of a flow tube 800, and FIG. 8B illustrates details of the flow tube 800 for Coriolis flowmeter 100 according to one embodiment. As described above, Coriolis flowmeter 100 includes a driver 180 coupled to a flow tube, e.g., flow tube 700, and configured to vibrate flow tube 800 in a drive direction. Coriolis flowmeter 100 further includes pickoff sensors 170L, 170R coupled to flow tube 800 and configured to measure the movement of flow tube 800.

Although the Coriolis flowmeter 100 described above includes a dual fluid conduit flowmeter, it should be understood that implementing a single or any other multiple conduit flowmeter is well within the scope of the present invention. Additionally, while the fluid conduits 130, 130' are shown as including a curved fluid conduit configuration, the present invention may be implemented with a flowmeter including one or more straight fluid conduits. Thus, the particular embodiment of the Coriolis flowmeter 100 described above is merely an example and is not intended to limit the scope of the present invention.

The flow tube 800 includes a conduit 852 having an inner surface 854. In embodiments, the conduit 852 may have a circular cross-section, an elliptical cross-section, or any other cross-section known to one of skill in the art. In an example of a flow tube 800 with a conduit 852 that includes a circular cross-section, the inner surface 854 is a cylindrical surface having four bends.

The flow tube 800 further includes a plurality of inserts, each of which is coupled to at least a first location on the inner surface of the conduit. For example, FIG. 8B shows a plurality of inserts 856a, 856b, 856c, 856d, and FIG. 8A shows additional inserts along other portions of the flow tube 800. Each of the plurality of inserts 856a, 856b, 856c, 856d is coupled to a respective location on the inner surface 854 of the conduit 852, e.g., first location 858 for insert 856a.

By disposing multiple inserts 856a, 856b, 856c, 856d along the inner surface 854 of the flow tube 800, turbulence can be created within the Coriolis flowmeter 100, thereby reducing errors that occur when the fluid being measured exhibits laminar flow.

The example flow tube 800 is not intended to be limiting. As one of ordinary skill in the art would readily appreciate, the flow tube 800 can include any number of inserts 856a, 856b, 856c, 856d to increase turbulence.

In an embodiment, the first location 858 of at least one of the plurality of inserts 856a, 856b, 856c, 856d can be located in an active portion of the flow tube 800. For example, at least one of the plurality of inserts 856a, 856b, 856c, 856d can be located in a portion of the flow tube 800 that is driven to vibrate by the driver 180, such as a portion of the flow tube 800 between the stiffener bars 140 and 140' in FIG. 1.

By providing inserts 856a, 856b, 856c, 856d in the active portion of flow tube 800, it may be possible to provide turbulence where the Coriolis forces are strongest and where pickoff sensors 170L, 170R are likely to be located. This may minimize errors caused by the Coriolis flowmeter 100 under-measuring the fluid under laminar flow.

In an embodiment, the first location 858 of at least one of the plurality of inserts 856 a, 856 b, 856 c, 856 d is within a bend in the conduit. For example, at least one of the plurality of inserts 856 a, 856 b, 856 c, 856 d may be disposed in a portion of the bend 802 a or 802 b, as shown in Figures 8A and 8B, respectively.

By providing inserts 856a, 856b, 856c, 856d within curved portions 802a, 802b of flow tube 800, it may be possible to create turbulent flow in the fluid under test, which may maximize the areas of turbulence, which may help further minimize errors caused by under-measurement of the fluid in laminar flow by Coriolis flowmeter 100.

In an embodiment, each of the plurality of inserts 856a, 856b, 856c, 856d may extend across at least 25% of the diameter of the conduit 852. Providing inserts 856a, 856b, 856c, 856d that do not connect to two separate portions of the inner surface 854 may allow for maximum turbulence during manufacture of the flow tube 800 without causing alignment issues that may arise if the inserts are connected to the inner surface 854 in two separate portions.

However, as one of ordinary skill in the art would readily appreciate, each of the inserts 856a, 856b, 856c, 856d may span any length relative to the diameter of the conduit 852. In embodiments, for example, the inserts 856a, 856b, 856c, 856d may extend across at least 30, 50, 70, or 100 percent of the diameter of the conduit 852.

However, in further embodiments, one or more of the plurality of inserts 856a, 856b, 856c, 856d may include a first end coupled to a first location and a second end coupled to at least a second location on the inner surface of the conduit. In an example, any of the plurality of inserts 856a, 856b, 856c, 856d may be positioned to pass through the central axis of the flow tube 800. However, in a further example, any of the plurality of inserts 856a, 856b, 856c, 856d may be positioned across a cross section of the flow tube without passing through the central axis of the flow tube 800.

In an embodiment, the plurality of inserts 856a, 856b, 856c, 856d may be shaped as rods. For example, the plurality of inserts 856a, 856b, 856c, 856d may include long, thin members having a circular cross-section.

In a further embodiment, the plurality of inserts 856a, 856b, 856c, 856d may be shaped as fins. By way of example, the fins may include substantially planar inserts having a longitudinal direction extending along the axis of the flow tube.

In a further embodiment, inserts 856a, 856b, 856c, 856d, 856e, 856f, 856g, 856h, 856i, 856j ...
Other shapes or orientations of 6c, 856d may be possible.

In an embodiment, the diameter of the conduit 852 of the flow tube 800 may be at least 2 inches. This may improve meter accuracy in larger meters where laminar flow is more likely to occur, resulting in undermeasurement of the test subject.

In an embodiment, the plurality of inserts 856a, 856b, 856c, 856d can include a first insert having a first longitudinal direction and a second insert having a second longitudinal direction, the first longitudinal direction being offset from the second longitudinal direction by 45 degrees or more. For example, FIG. 9 illustrates a cross-sectional view of a flow tube 900 according to one embodiment. In FIG. 9, it can be seen that the first insert 956a has a first longitudinal direction 902a and the second insert 956b has a second longitudinal direction 902b. In an embodiment, the first insert 956a and the second insert 956b may be disposed at the same or different positions along the length of the flow tube 900. The first longitudinal direction 902a is oriented to be offset from the second longitudinal direction 902b by 45 degrees or more.

By orienting one or more of the multiple inserts 956a, 956b in different directions, the ability of the flow tube 900 to generate turbulence in the fluid under test can be improved.

FIG. 10 illustrates a method 1000 according to one embodiment. Method 1000 can be performed to assemble a Coriolis flowmeter according to one embodiment.

The method 1000 begins at step 1002. In step 1002, a flow tube is provided, for example comprising a conduit 852 having an inner surface 854 and a plurality of inserts 856a, 856b, 856c, 856d, each of the plurality of inserts 856a, 856b, 856c, 856d comprising at least a first insert 856a, 856b, 856c, 856d on the inner surface 854 of the conduit 852, as described above.
A flow tube 800 may be provided that is coupled to a location 858 of the flow tube 800 .

In an embodiment, the flow tube 800 may be formed by drilling, machining, or wire EDMing one or more holes through the conduit 852. Then, each of the plurality of inserts 856a, 856b, 856c, 856d is inserted into each of the plurality of holes and welded, brazed, or otherwise coupled to the conduit 852, thereby sealing the flow tube 800 against fluid leakage.

In a further embodiment, the flow tube 800 may be manufactured by injection molding.

Method 1000 continues with step 1004. In step 1004, a driver is coupled to the flow tube, the driver configured to vibrate the flow tube in a drive direction. For example, driver 180 may be coupled to flow tube 800 using any coupling technique known to those of skill in the art and may vibrate flow tube 800 in a drive direction as described above.

Method 1000 continues with step 1006, where a pickoff sensor is coupled to the flow tube, the pickoff sensor configured to measure movement of the flow tube. For example, pickoff sensors 170L, 170R can be coupled to flow tube 800 using any coupling technique known to one of skill in the art to measure movement of flow tube 800.

Method 1000 may enable the assembly of a Coriolis flow meter without the undermeasurement problems found in flow meters used with fluids under test that have Reynolds numbers Re less than 100,000 and therefore tend to exhibit laminar flow.

In an embodiment of method 1000, the multiple inserts can be molded as a rod as described above.

In an embodiment of method 1000, the multiple inserts can be molded as fins, as described above.

In an embodiment of method 1000, the first position of at least one of the multiple inserts may be located in the active portion of the conduit, as described above.

In an embodiment of method 1000, the first location of at least one of the multiple inserts may be located within a bend in the conduit, as described above.

In an embodiment, each of the plurality of inserts may extend across at least 25% of the diameter of the conduit, as described above.

In an embodiment, each of the plurality of inserts may include a first end coupled to a first location on the inner surface of the conduit and a second end coupled to at least a second location, as described above.

In an embodiment, the diameter of the conduit may be at least 2 inches, as described above.

In an embodiment, the plurality of inserts 956a, 956b can include a first insert 956a having a first longitudinal direction 902a and a second insert 956b having a second longitudinal direction 902b, where the first longitudinal direction 902a is offset from the second longitudinal direction 902b by 45 degrees or more.

Thus, while specific embodiments have been described herein for illustrative purposes, various equivalent modifications are possible within the scope of this specification, as will be understood by those skilled in the art. Accordingly, the scope of the above-described embodiments should be determined from the following claims.

Claims (18)

a driver (180) coupled to the flow tube (800, 900), the driver (180) configured to vibrate the flow tube (800, 900) in a drive direction;
a pick-off sensor (170L, 170R) coupled to the flow tube (800, 900), the pick-off sensor configured to measure movement of the flow tube (800, 900);
The flow tube,
A conduit (852) having an inner surface (854)
and a plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b), each of said plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) comprising a flow tube having an insert coupled to at least a first location (858) on an inner surface (854) of said conduit (852);
A Coriolis flow meter (100) comprising: The Coriolis flowmeter (100) of claim 1, wherein the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) are shaped as rods. The Coriolis flowmeter (100) of claim 1, wherein the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) are shaped as fins. A Coriolis flowmeter (100) according to any one of claims 1 to 3, wherein the first position (858) of at least one of the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) is within an active portion of the conduit (852). A Coriolis flowmeter (100) according to any one of claims 1 to 4, wherein the first location (858) on the inner surface (854) of the conduit (852) is within a bend (802a, 802b) of the conduit (852). A Coriolis flowmeter (100) according to any one of claims 1 to 5, wherein each of the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) extends across at least 25% of the diameter of the conduit. A Coriolis flowmeter (100) according to any one of claims 1 to 6, wherein each of the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) includes a first end coupled to the first location (858) and a second end coupled to at least a second location on the inner surface (854) of the conduit (852). A Coriolis flowmeter (100) as described in any one of claims 1 to 7, wherein the diameter of the conduit (852) is at least 2 inches. The Coriolis flowmeter (100) of any one of claims 1 to 8, wherein the plurality of inserts (956a, 956b) includes a first insert (956a) having a first longitudinal direction (902a) and a second insert (956b) having a second longitudinal direction (902b), and the first longitudinal direction (902a) is offset from the second longitudinal direction (902b) by 45 degrees or more. providing a flow tube (800, 900);
coupling a driver (180) to a flow tube (800, 900), the driver (180) configured to vibrate the flow tube (800, 900) in a driving direction;
Coupling pick-off sensors (170L, 170R) to the flow tubes (800, 900), wherein the pick-off sensors (170L, 170R) are coupled to the flow tubes (800, 900).
900),
13. A method of assembling a Coriolis flowmeter, wherein the flow tube includes a conduit having an inner surface and a plurality of inserts, each of the plurality of inserts being coupled to at least a first location on the inner surface of the conduit. The method of claim 10, wherein the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) are molded as rods. The method of claim 10, wherein the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) are shaped as fins. The method of any of claims 10 to 12, wherein the first location (858) on the inner surface (854) of the conduit (852) is within an active portion of the conduit (852). The method of any of claims 10 to 13, wherein the first location (858) on the inner surface (854) of the conduit (852) is within a bend (802a, 802b) of the conduit (852). The method of any of claims 10 to 14, wherein each of the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) extends across at least 25% of the diameter of the conduit. 16. The method of claim 10, wherein each of the plurality of inserts (856a, 856b, 856c, 856d, 956a, 956b) includes a first end coupled to the first location (858) and a second end coupled to at least a second location on the inner surface (854) of the conduit (852). The method of any of claims 10 to 16, wherein the conduit (852) has a diameter of at least 2 inches. 18. The method of claim 10, wherein the plurality of inserts (956a, 956b) includes a first insert (956a) having a first longitudinal direction (902a) and a second insert (956b) having a second longitudinal direction (902b), the first longitudinal direction (902a) being offset from the second longitudinal direction (902b) by 45 degrees or more.

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